Problem solving strategy:

Remember that 1 mole of an element contains 6.022x 10²³ atoms

Solution:

6.022 x 10²³ Ti atoms = 1 mole of Ti

1 Ti atom = $\frac{1}{6.022 \times 10^{23}}$ moles of Ti

3.011 x 10²³ Ti atoms = $\frac{1}{6.022 \times 10^{23}} \times 3.011 \times 10^{23}$ moles of Ti

3.011 x 10²³ Ti atoms = 0.5 moles of Ti